 Roadrunner
With feathers, birds can keep out of external cold, heat loss and as well as external heat
gained, for feathers can trap a layer of insulating air. The feathers are under muscular
control and can be held erect. When there is a breeze, the upright feathers direct the air
movement down to cool the skin.
Birds cannot sweat. They pant or flutter to
remove heat.
Some flesh-eating birds don' t need to drink as
they can get enough moisture from their preys. The seed-eating birds need to drink daily
and thus they are restricted in a number of places where they can nest. |
Birds find shelters underground, in the shade of rocks or bushes.
Flying at high attitudes enables them to avoid heat. Birds can tolerate 3oC
body temperature rise above normal level. No birds can survive at above 45oC.
Birds have highly accurate navigational
skills that enables them to discover waterholes.
